| BCH MECHANICAL, L.L.C.Largo, FL · Active | Largo, FL | LLC | Mar 22, 2017 | Active |
| ROYALAIRE HOLDINGS, LLCOldsmar, FL · Active | Oldsmar, FL | LLC | Mar 22, 2017 | Active |
| ROYALAIRE MECHANICAL SERVICES, LLCOldsmar, FL · Active | Oldsmar, FL | LLC | Mar 22, 2017 | Active |
| RIGHT WAY PLUMBING & MECHANICAL LLCSunrise, FL · Active | Sunrise, FL | LLC | Aug 29, 2024 | Active |
| COMFORT SYSTEMS USA (SYRACUSE), INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Jun 21, 2023 | Active |
| S.I. GOLDMAN COMPANY, INC.Longwood, FL · Active | Longwood, FL | Corporation | Oct 4, 1976 | Active |
| ELDECO, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Mar 19, 1975 | Active |
| S.M. LAWRENCE COMPANY, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Nov 20, 1980 | Active |
| STARR ELECTRIC COMPANY, INCORPORATED OF NORTH CAROLINALocation not reported, FL · Active | Location not reported, FL | Corporation | May 25, 1983 | Active |
| COLONIALWEBB CONTRACTORS COMPANYLocation not reported, FL · Active | Location not reported, FL | Corporation | Nov 26, 2007 | Active |
| ACI MECHANICAL, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Dec 29, 2008 | Active |
| DILLING GROUP, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Nov 16, 2009 | Active |
| TAS ENERGY INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Apr 25, 2011 | Inactive |
| TENNESSEE ELECTRIC COMPANY, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | May 25, 2018 | Active |
| DECCO, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Feb 21, 2025 | Active |
| TAS ENERGY, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Jan 30, 2026 | Active |
| COMFORT SYSTEMS USA (SOUTHEAST), INC.Pensacola, FL · Active | Pensacola, FL | Corporation | Jul 1, 1998 | Active |
| ROYALAIRE MECHANICAL SERVICES II, LLCOldsmar, FL · Inactive | Oldsmar, FL | LLC | Mar 22, 2017 | Inactive |
| IVEY MECHANICAL COMPANY, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Mar 12, 2003 | Active |
| COMFORT SYSTEMS USA STRATEGIC ACCOUNTS, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Apr 7, 2008 | Active |
| SUMMIT INDUSTRIAL CONSTRUCTION, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Sep 20, 2011 | Active |
| ENVIRONMENTAL AIR SYSTEMS, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Oct 19, 2011 | Active |
| E SOLUTIONS FL, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | May 12, 2022 | Active |
| CENTURY CONTRACTORS, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Apr 9, 2025 | Active |